One could just as easily say the WotC was opportunistic enough to scoop up the remnants of a dying competitor, which happened to include the #1 brand name in the RPG genre.
You see, it is all in the connotation. You could just as easily say "opportunistic" or "clever" or "foresightful" - the first has a bit of a negative connotation, the others positive.
Let us remember that, at the time, when we talk about WotC, we are in large part talking about one dude - Peter Adkison. While he has notable qualifications as a businessman, he also personally loves games in general. You want to cast a guy who loves games and has the oomph to buy D&D and do something with it when D&D was flagging as "opportunistic"? Okay,m I guess...
What it comes down to is this: was it good that they did so, or not? They produced an awesome couple of games, that loads of people love, and many fine products. What's to be negative about?
The heroism angle, whether directly stated or implied, is just good marketing. (which one can't really fault a business for doing)
Except that, as stated above, WotC isn't doing it! That puts a major dent in the spin, there. Find us a quote where some WotC person, speaking officially, says that WotC "saved D&D", and maybe you'll have something.
My saying that I'm happy that WotC saved D&D does not count as "marketing" on WotC's part. Failure to actively deny such statements (as if they'd hunt around the messageboards of the world and pounce on people who like them) also does not count as "marketing". It counts as, "free good press for which they bear no responsibility whatsoever."