The comparisons to the dotcom bubble (as if it's already happened) don't make sense. The altcoin market is in a much more nascent state then that. Clearly there is no Amazon or Google or Facebook. This is probably more like the pre-Yahoo stages where everything is still complete shit. I think it's simply crazy to assume the market has already "matured" and that over-speculation is unlikely to continue.
The bolded bit is v interesting to me. I well and truly can't believe the current crop of exchanges is where the market will settle. The money required for something dotcom sized will be on established channels, not new ones.
I don't believe those types of places will have the slightest interest in listing all but a handful of alts.
But we're nowhere near the market settling or a dot-com sized bubble. We're just on the cusp of the next bubble. There's no reason to speculate about what might happen 10 or 20 years down the line when the market is finally "mature" or something. I'm just interested in what's going to happen in the next year or two. Altcoins are still very much a retail affair.