Apart of #1 I do not see #5 coming. There is no space, no need. Bitcoin works and is exactly what grey and black gambling markets need. Nothing else can emerge that would be that much decentralised and that much resistant to blocks. Legal markets do not need blockchain processors.
#2 I have no idea who can yet merge. Maybe bet365 will finally buy the failed competitors? But I do not think they want to get their hands dirty.
#3 is easy, growth from zero is always massive
I can see only #6: states will disrupt and kill the gambling industry and affiliate industry even more than before.
If you talk to God, you are praying; If God talks to you, you have schizophrenia.