Regarding skins for tft

So I looked a little around, and it seems like you can purchase them only with rp, which I do not really judge, would be nice a f2p option but that's it. The problem I have it, TFT is not a permanent gamemode, so spending RP on it is honestly a waste of money. So I wanna ask, and preferably be answered by a riot, are there any plans to keep tft permanent or made other ways to get playable skins for that gamemode?
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