So, any thoughts on this guys? do you agree that raiblocks will replace bitcoin one day?
While raiblocks brings some interesting ideas, no, it won't replace Bitcoin. There are already many better altcoins than Raiblocks and even those cannot really compete yet with Bitcoin.
And only the transaction speed and fee are by far not enough to make a coin competitive. There are plenty of coins with very fast transaction times and low and zero fees.
Also, Bitcoin has some bad news for those coming up with only these features: Lightning network is in process of getting deployed.