It's never too late for Bitcoin and NO, it isn't a bubble. But I understand why people are prone to thinking that kind of stuff.
Unfortunately, a lot of hype and adverse publicity referring to Bitcoin as a bubble somewhat ruins its reputation by making people feel prejudiced towards the most trusted cryptocurrency.
However, neither bad publicity, nor prejudice can totally ruin Bitcoin's reputation and with time, as people become more aware of what it really is, the Bitcoin will be more trustworthy and then those who invested in it will the winners with the rest of them wishing they had done it before.