You sell assets early, you pay the loan off early, you get rid of tier one early. You still have to deal with tier 2 and 3, and now you have less assets to sell when you dump the company as a whole.
Lower leverage is not good for business, at least day to day (you are right about less risk in case things blow up again). If a client has $1,000 and has 50 for 1 leverage, that client could make up to $50K in trades, technically (though stupid). If leverage is down to 10 to 1, that client can only make $10K in trades. That client makes 5x less in trades, FXCM makes 5x less money. Trades are based on spread and not a flat rate like for stock brokerages so volume impacts commission revenue in a direct linear relationship.