As others have said – it’s very simple don’t upgrade and it won’t cost you a penny. FCP as it stands works fine and you can spend a year or two making money with it. Then perhaps you might budget enough for the paltry $500 it will cost you to upgrade.
Personally, as it stands, if Apple hadn’t offered any upgrade path at all, I’d STILL buy the whole suite again just to get those features and I’d make the money back in the first month!