They may be out/in of the top 20 a little (very dependent on *other* releases), but I would expect them to sit in the top-20 for maybe the entire life of the Wii - or at least 2-3 years. Look at Brain Training 1 - even the release of BT2 on the DS couldn't stop the sales of this beast. Currently sitting at #20, 94 weeks in the charts (2 years!) - 3.5mill sales. Of course BT2 is only at #13 (this week), 65 weeks - 4.5 mill sales. These Wii titles will only be displaced by other titles that establish themselves as better week in/out sellers. (on a side note - does MH2 have a chance of outselling Wii Sports - long term? What about Wii Play?)
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