I think one of the greatest things on peoples' minds with regard to MeeGo is the fear that Maemo5 will no longer be supported.

Maemo5 came out of the oven pretty raw and people would like to see their 500+ dollar device be perfected by Nokia in times to come.

Feature-wise I think MeeGo and Maemo are going to be very similar, with the exception that any new functions new technology will bring will more likely be updated to MeeGo but not Maemo5.

In short, people fear that MeeGo being the replacement of Maemo will mean that they're stuck with something that's old and dated less than a year from its launch.