imo I would still be cautious. SR accounted for ~300-400 million in revenue a year for bitcoins. Much of which was from fresh money being brought in by customers. I don't know of anything else in the same stratosphere in terms of bringing in money into the network. SR was/is a big deal. Will there be other sites to take its place? Sure.. but to what extent they will fill that void remains to be seen. Also will customers/vendors of these sites be weary about jumping back into this market?
Bitcoin doesn't earn revenue, and SR was mostly neutral for supply and demand.
Buyers bought btc, sellers sold btc to buy product.
Its just one data point but the amount of BTC seized (26,000 by one media outlet) tells us how much SR was affecting the supply of coin. In other words, not much. And this coin may be tied up as evidence for quite some time so its confiscation is not about to affect supply.
However, I would imagine that the SR economy formed a group of people willing to buy and sell at the current price whatever that might be (I'm assuming the drug price is in USD and constantly repriced in BTC, and of course that addicts need for a fix is fairly price insensitive -- but I don't actually know having never been to SR). So some liquidity may leave the system.