I would like to see the Grin team push for and focus heavily on atomic swap protocols between BTC, ETH, GRIN, etc. With a clear atomic swap standard, any coin wallet would be able to implement the protocol enabling currency swaps without an exchange.
After such a standard in place, the industry would be enabled to develop order book relay networks and historical price data. The idea is to allow for an industry of applications acting as communication middlemen for exchange bids/asks.
The end goal is to enable any wallet (whether single-coin or multi-coin) to access an open network of exchange data and a protocol for swapping between assets that the wallet supports. The hope is that such an open network wouldn’t not suffer as great of regulatory scrutiny as a company-backed exchange.
My =)2