Positive: Bitcoin gets more publicity, the market gets more volume which is always a good thing

Negative: when most users are investors, it's easier to take over Bitcoin. Imagine government saying that either Bitcoin protocol will have to change or it will get banned. Most investors will support this fork because it will protect their investment at least in short term, so the majority of PoW and money will be on the side of the fork, and true Bitcoiners will be left in the minority. They will keep calling the original chain Bitcoin, but for the rest of the world the new chain will be Bitcoin.