I didn't mean that you would trade powers with EACH OTHER!!! Guys, work with me...
with the trade feature, you would either take on a new power that day, or exchange the one you currently have for another power...that's all. You would NOT exchange with any other user, and their powers would not be affected in any way, shape, form, order or fashion as a result of YOUR power choices.
It would not be the downfall, because you could even make it a random thing like the choosing of powers; you could look for the orange "get this power" button, or the "trade for this power" button or whatever, which would have to be a different color than the "get this power" button to prevent confusion.
“…Judge not what a man has done, but judge what he could have done if he was a different bloke altogether. For art thou a leper? And a leper can changeth his spots…” --Rudy Wade, Misfits (Series 4, Episode 8)