Bitcoin price would crash badly as it is easy for 51% attack.
Yes, I do it twice before breakfast every morning

Edit: Holy crap that's a senior member, how the hell are you around here this long and not even get a clue by osmosis.
It is actually true that one mining entity has over 45% mining power several times in history. If the community does not advocate the miners to leave that entity, it will be over 51%.