Uniswap v2 market is something that Aave team can deploy with the v2 of the protocol if the there is enough support from the community. Here are some answers:
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No negative effects as the markets are deployed on their own smart contracts, meaning that gas cost will not increase for other markets
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Not any technical limitations that I would see at the moment, so Uniswap v2 market is possible :)
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As it could be added as a separate market (as was done with Uniswap v1 money market) it does not add additional risk to the main or other markets. Also interesting note is that with stablecoin LP pairs there is actually less volatility and less market risk in that sense. Hence they are quite interesting assets as collateral.