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The opportunity that the early investor had was to be able to afford bitcoin because it was cheap. I think the opportunity they had then is still present, bitcoin is in the cheap state now that anyone can afford it . This is the same opportunity the early investors had.
Buying Bitcoin at the price which bitcoin is will be of good gains, because if the market bulls we never know where the price is heading to, if it is an amount that will be high that some persons won't be able to afford it that can be regrettable for not buying Bitcoin when it was cheap.
I'd see NO, if we compare the price 10 years ago, we can really see a big difference which I think that early investors had enjoyed buying 1 Bitcoin at a cheaper price which, unlike today, it was hard to accumulate 1 Bitcoin, unless if you are a rich person. Therefore, I would it was late already but never I say it was TOO LATE for we still have the chance to invest in Bitcoin. It only matters with time since it was impossible to bring back the price of Bitcoin 10 years ago. The most important is that we still have the chance to join the party and make part of this technology.