It'd be the equivalent of the US closing the Cape because we got a deal on a better launch site. Given all the infrastructure and launch support facilities they have there, I just don't see them closing it anytime soon. Just think of all the facilities they have there for things like vehicle and payload integration, launch control, fueling, etc.

By way of comparison, back in the 1980s the USAF spent about $6 billion preparing a Shuttle launch facility at Vandenberg (SLC-6). Only a small fraction of that amount went to the launch pad. The rest went for support facilities and the like.

It's definitely in Russia's interest to pursue launch facilities at lower latitudes (Baikonur, AKA Tyuratam) is at 49 degrees north latitude. That really hurts them when it comes to putting payloads into LEO and even more to geosynch.