None of that is true. ASICs don't make more people interested, they completely shut CPU/GPU miners out and waaay more people have CPUs and GPUs then ASICs.
ASICs cause centralization, there are trust issues with some ASIC companies, they may or may not use their hardware before shipping them when it's super profitable, delayed shipments (likely because of the previous point) and old ASICs become completely worthless.
ASICs costs money yes, but that's not an investment into a coin. They don't bring any money in, their aim is the opposite. It's all about the value of all the coins that can be mined each day.
There are hundreds of different ASIC coins, not just one of each so some flexibility is there as well. ASIC miners also jump around to mine the most profitable coins.
You got it ALL wrong. ASIC companies couldn't care less about any coin. They're not investing in any coin, nor they support them, at all.
The one and only reason for a company to decide to invest into R&D ASICs is if a coin has a high value mining emission rate (all the coins that can be mined in a day are worth a lot) - and obviously enough liquidity. That's the only thing they're after because that's what will get people to buy their hardware (prospect of profit) and in return get those companies paid. There's no charity, no investments, no support, just a simple equation determining if it's worth the money to spend $X to R&D ASICs.