If you don't care about the security of your coin enough to buy efficient hardware with which to secure it that is fine, there are still coins that people do care about enough to invest fortunes into securing them so despite your constant bait-and-switch running on to new coins abandoning the ones you had created the illusion of investment in by mining them there will be secure coins. Presumably you dump those bait-and-switch scam coins too as well as abandoning them.

ASIC manufacturing is already more distributed than GPU manufacturing, isn't it?

If GPU makers have not yet started building mining farms that might just point to how tiny even the market caps of the highest cap coins currently are, rather than any inherent greater security having only a couple of manufacturers, but currently having a few other lines of application to profit from, might provide.

If GPu makers did decide to get into mining (don't they "burn in" GPUs before shipping them?) it would be interesting to see whether they prefer to use GPUs for that themselves or build something more efficient for the purpose. Fortunately others are already making ASICs for mining available to wider audiences so by the time the GPU makers do decide to get into it they hopefully won't have as close to a monopoly as they have on GPU manufacturing.

-MarkM-