<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by Plato90s:
I think Shareholder explored this question. Because there aren't many incremental benefits once you hit that top-level, some people may choose to spread out their remaining travel to other carriers to have flexibility and gain additional benefits.</font>
I think I shall take that as a "yes"

- what should the airlines do to prevent this loss of business though?
Sorry if this has been explored before - I didn't do any research - the thought just struck me.