I've said it before, if the US gov't can't stop kilos of heroin and coke from coming across the borders every single day, let alone pounds of actual weed from Mexico and Canada (and empirically, they can't) there is no way they're going to put an end to the importation of cannabis seeds. Market demand creates supply.
In practice, the "worst" thing Uncle Sam can do is up the scrutiny at customs to catch many more beans, and they've already been doing that. They can also make it harder to pay for beans, by limiting credit card and certain kinds of bank transactions (which again, they have been doing). So they can make it harder to buy beans, and make the likelihood of a successful purchase lower.
But in the long run, all that really does is drive up costs. The cost of individual purchases goes up to make up for the many that don't make it through. Cash and cash-equivalent transactions are still doable and there really isn't much the gov't can do to stop them. A tighter market will probably drive many of the smaller players out of business, but really, that may not be such a bad thing.
More to the point, over the long run, I just don't think its going to matter much, because with the current trend of legalization, the domestic seed supply will only continue to get better and better.
Right now, in several states you can walk into a dispensary with cash and walk out with excellent quality beans. I think in CO right now you don't even need a card or to be a State resident to do it. There are 1-2 sellers I'm aware of that are (or at least were until recently) dealing beans from within the USA and I'm sure there are plenty more off the radar that can be found if you know where to ask/look. Its always possible to make your own beans and/or trade with others. Availability of excellent clones also makes beans somewhat less necessary.
So bottom line, yes there are ongoing changes in the beans business, and yes, going forward it may be harder to import them. On the other hand, there are plenty of fantastic genetics already here in the USA, including several top notch breeders who have set up shop in CO. If the foreign supply gets restricted, the domestic supply will only increase to make up the ever-growing demand.