It's sort of moronic to imply that Vince was cursing ECW from the beginning and wanted it to fail. IF he didn't want it, he would've changed the name mere months after it's debut. It's been almost 4 years.
As the owner and creator of the modern WWE franchise, he would be shooting himself in the foot in the biggest way possible to undermine his own product. Also, as the owner and creator of the WWE Franchise, he's in it to maximize buyrates, draws, and overall PROFIT. Again, it would be shooting himself in the foot as a business-man trying to make money.
It's almost the same idea as the owner of a sales store to go and sell his product like they are crap in favor of better selling brands. Regardless of the product, they're going to sell it like it's gold, and that's also Vince's job as the owner and everyone beneath him to try and make a product work and be as profitable as possible.
Many things worked against ECW, and it was not Vince. Being situated on SyFy had a part to do with it. Also, the fact that there were obscure names mainstream fans had never known about attributed to it as well. The 1 hour show also limits ANY shows potential, so this obviously works against it.
And I'll also go out on a limb (and also accept neg reps because I think I'll get some), that not EVERYBODY enjoys "hardcore wrestling". In fact, it's a very small faction of the total wrestling populace that actually enjoy matches filled with ridiculous weapon spots and needless gore. These sorts of matches really only cater to one niche of wrestling fan, not a wide variety. ECW is remembered for it's hardcore wrestling by mainstream fans, but no one remembers the fantastic matches that put both WCW and WWF to shame at the time, but regardless, it's remembered for it's storylines, characters, and match rules that pushed the boundaries and then some. Not everyone are fans of this, and thus, again, catered to only a small niche grouping of fans.
ECW was doomed from the beginning not because of Vince, but because of what it WAS. It's only natural that they took it in this direction, not out of respect for the original ECW, but out of respect for Vince's wallet.