Inclined to agree Amazon might garner a substantial lead for Android tablet app distribution, but theres still an awful lot of phones, compared to tablets and I for one cannot see this changing in the short term.

One good thing to note is Android 4.0, is asking for credit card details on initial start up now, so hopefully paid users++ when it comes to the Google Market, which might also help quell the myth of Android users "don't buy apps" which I feel at the moment is self reinforcing by the fact most published apps choose to ad support