This new coin will probably take many of the innovations that we've seen in other coins.
He can easily prove his identity here on Bitcointalk.
If all this happens, the media coverage for Bitcoin will be at an all time high, and could possibly multiply the current crypto users.
This new coin could probably kill Bitcoin.
bitcoin is like satoshi's baby and why would someone abandon his baby and make another one in its place and want to push that to the public?!! that doesn't make sense to me so it is not a legit possibility.
besides if satoshi was looking for profit from making a pump and dump altcoin he would have sold his bitcoin stash when the price was above $1000+
He wouldn't be creating a pump and dump coin, he would be motivated by whatever motivates him. The suggestion is what can surpass Bitcoin, not kill it. Satoshi creating a new coin would not kill Bitcoin.