I recommended this because I don't think its possible to lump all spells into the same page even though they seem similar. Each game makes each spell unique in some way. For example, Hurt (DW1), Firebal (DW2), Blaze (DW3) are all the same spell pretty much. But each game makes them different. How do you differenciate between Firebal (DW2) and Firebal (DW3)? With your logic someone will look up Firebal for DW2 and get the description of Sizz, and if they haven't played the newer games, will be totally confused.
Again, there will be indication in the articles regarding other titles. Any confusion will hopefully be remedied if the individual takes the time to look at the page and see that what they're looking for is actually there. Any differences between games would also be noted under their appropriate headers, such as the nature of Firebal in II and how it became a group attack in III (additionally, the stronger from, Firebane/Sizzle, is present in both II and III and acts as a group targeting spell).
Heck, my original take on it was to have all spells in that spell's 'family' being under one article (ie, the Frizz article would've also had the info for Frizzle, Kafrizz, and Kafrizzle). This was probably trying to be too organized. Treating each spell individually is probably for the best, but by each individual name might be going a tad extreme.
The way I suggest is basically do what DQ fansites, just like Dragon's Den, do. List every single spell based on their specific game. When someone does a search for Firebal, the search will bring up both DW2 description, and DW3-7, and even Sizz (4ds, 5ds, 8, 9) because they are related, they're synonyms based on the description.
Same thing goes for weapons and armor. How are you going to lump the Broad Sword, Iron Broad Sword, Steel Broad Sword, Iron Sword, etc together as the same weapon when they are completely different based on whatever game they are in?
I'm not sure of the specifics, but I believe there are ways to make redirects also lead to certain tags placed in an article. In this case, typing 'Firebal' into the search would link to the Sizz article, but place the viewer at the first instance of Firebal (which I believe would technically be II, even though the GBC remake of I made Hurt and Hurtmore into Firebal and Firebane, I believe). Again, though, I'm uncertain of the code behind this and wouldn't know how to do it presently.
And lumping together content isn't hard when there are headers that can be put in regarding appearance pertaining to game. Also, if the objective becomes making the articles game specific, we'd have over 10 instances of the slime article because of its appearances throughout the entire series, which is a bit much. And then if you apply that to several other recurring monsters, like drackies, bubble slimes, restless armours, and so many others... my initial guess of the articles tripling goes more in the range of an increase by sixfold. There'd possibly be over 10,000 articles, and that's nothing brag-worthy when most articles are practically copies of one another. They may have differences, but I don't think these differences would merit making several small articles when a single one can easily contain all the info in an organized way.
I'm probably exaggerating those numbers in my head, though. I've always been more into monsters, so my thoughts usually turn to those articles, and there are quite a few critters throughout the games, though they may not be able to meet the same numbers as characters, spells, and locations put together. Chances are my triple-guess would probably be more accurate with the articles-per-game, but that still seems excessive and prone to near-duplicate articles.
