I asked the same question in Telegram this morning. According to the previous analysis, the stream of fees ($1000) is too low at the moment in comparison to the $IDLE funds (almost 2 million tokens) held by the governance. So a cryptos 90% / IDLE 10% pair would have much lower liquidity than a pair IDLE 90% / cryptos 10%.
And have liquidity is the scope of this proposal.
I think that the tradeoff in Balancer pool can be changed even in a second moment