Do you think more miners will join if Bitcoin gains more adoption? Their is a cost to even find out if decentralization (through blockchain) is even worth it.

How? They can't. My PC, laptop and phone can't mine bitcoin.

The way to achieve true decentralization is ASIC resistant mining algorithms and some form of diminishing returns to force miners to operate at small to medium scales. We need lots and lots of small miners running on commodity hardware that people already own, not a few large scale operations running on expensive custom silicon.

You make some great points. My points were for crypto in general, so do you think a crypto will come that is truly decentralized and can be mined more easily?

I think Monero is closest to the original cryptocurrency dream. Not perfect but closest. It has ASIC resistant algorithms to make mining with normal CPUs feasible.