nope. bitcoin was developed from the idea that most users or shall i say all users mine.
just like with bittorent all users serve files. again strenght is in decentralization. your notion of professional miners runs against the idea of decentralized - distributed transaction confirming network. it is against the original bitcoin idea. but hey nothing here is set in stone right?
i can afford an asic. in fact i bought one. so from my point of view i still can make some money. but still i don't think asic is a good idea for bitcoin.
That IMO is a impossible idea to achieve as the vast majority of the world does not own a PC with a GPU let alone an entire rig to "compete" with what most miners pump out now. Mining will always be specialized when taking the "bigger picture" look at things. Bitcoin mining has always been the more power a user can produce the more they can mine. It's just operated under the assumption that enough people will be mining so that one person can't take over the network, which so far will continue to be the case due to the vast number of ASIC orders from just the initial batches alone.
The network will still be decentralized, it will just be on ASICs instead of GPUs so the pool will shrink at the start. As you can tell as someone who's bought a ASIC, it will not just be centralized groups, it will still be individual miners such as yourself. That pool could easily increase however, if the price of bitcoin increases as the difficulty goes up making ASIC mining still profitable for those who get in "late". All of the charts currently projecting ASIC ROI vs difficulty all assume a stable price(which has already increased to 139 as I type). If enough venders, buyers and speculators continue to adopt and use bitcoin we could even see GPU mining continue some profitability regardless of the drastic difficulty increase.
Of course the reverse could happen, and BTC could crash and become worthless thereby making ASIC purchasers SoL. It's a risk that's debatable whether it's still worth taking, but sometimes with big risk comes big rewards. I just feel the position held by the OP that the ASICs signal the death of bitcion is far fetched, and you've done little to sway my opinion. Bitcoin has always been something that will either turn out to be huge, or end up worth nothing.