I want to say. (English is not my mother tongue)
The more adoption the more spammers. ( if only 0.1% is malicious then it is 1,000,000 spammers for every 1,000,000,000 adopters )
The more full nodes the more upgrade of whole network will cost.
=> result: increasing block size can kill bitcoin
That makes sense. English is my mother tongue, but I can't explain it any more clearly than this: