MPW was paying all income as dividend in the past, now that they make more than the dividend, there is no way that they cut. The 90% is the minimum a REIT must pay, not the maximum. Check the company's history, eps vs. dividends, do some DD before you people jump to conclusions.
Must pay out 90% of EARNINGS, not 90% of FFO (Funds from operations). Paying out 90% (or more) of FFO isn't very prudent. Leaves little margin for error and retains little for reinvestment to grow the business.