Yes there are challenges with adoption. Limiting the transaction capacity will not help.
It is a very stupid argument. Saying that current block size is limiting adoption is like saying a place is not attractive to people because it's overcrowded...
For minors is not important the number of people and entities that pay tx fees but the overall tx fees paid! Of course, the size of the adoption is important but even more important is the quality of the adoption. Increasing block size and giving free block space to even more spam will not help bitcoin adoption for sure!
people(general users) dont want 4cent tx fee's, they want 2cent tx fees(or less). they definitely wont accept 8cent fee's
at 4cent, 1mb blocks get $160(1mb=4000tx=$160 at 4cent each)
miners dont want $80(1mb=4000tx at 2cent=$80) they want $160(or more)
so miners have a choice..
stick to 1mb and take a cut to please customers.. ($80).. without being greedy!
or increase to 2mb and please customers aswell with lower fee's... yet keeping their stash of $160(2mb=8000tx=$160 at 2cent each)
or if greedy.. 2mb and 4cent fee at max = $320 fee total potential(greedy but acceptable)
but sticking to 1mb and jumping to 8cents a tx is totally going to ruin bitcoins usefulness. while revealing greed as the killer of all the positives of what made bitcoin better than fiat in the first place