You don't lose anything. You can continue to worship any arbitrary denomination of units you want.
You could call them megabitcoins, or even BTC.
Names are subjective anyway.
But now, if you do, you will know you are being arbitrary and incorrect :)
Discussion
You do lose the perception of less bitcoin units as people perceive it today. Not sure if it matters in the long run though but people will absolutely hover on this “issue” in the short term.