No it is not too late, although if you have waited this long you may be sad because the price did a x4 in just this last 8 months. I believe in time a 10k bitcoin is not very hard to achieve so no it's not to late, not this time at least.
I dont think so. Bitcoin price is now very big and it has a high demand on the market now. So if you buy its good because you will earn a lot months from now. So i think it is good to earn bitcoins or buy now.
In other words even though the current price of bitcoin has soared very high. But that does not close the possibility for bitcoin prices to continue rising. Bitcoin prices are still very likely to rise even several fold. See the potential of bitcoin development. I think it's not too late to invest in bitcoin