If all else fails, maybe we can go back to the days of Metal Gear Solid, and just sign everyone under pseudonyms. If actors really want the job, but don't wish to get the guild involved, maybe they can work out a deal with the developers.
Maybe some people are more attracted to the project when a particular actor is involved. Do they deserve extra revenue once the project is complete? I don't know, if profits are being made, everyone who touched it should deserve extra, not just the actors. This isn't a movie or a cartoon where the acting sells the product because it's purely visual. Videogames are interactive, the player is just as much a part of the experience as any of the components.
I think the ultimate goal which had never seemed to be an issue in my eyes, is job security. Voice actors, if competent, will often find themselves being hired again and again for new jobs. Perhaps it is in part due to the guild, but they would probably be just as likely to be rehired by a particular dev team, or by several, if their performance is good. Devs on the other hand if they don't belong to one of the big AAA will panic at the end of any project if they will have a job by the end of the year. VAs should be happy that many continue to get work, without getting royalties.
If anything, if a studio comes out with a decent profit, it could mean money used in the next project, to hire the same actors back again. If the VAs take from the pot, and subsequently animators, programmers, writers, ect, from the profit table less can be put into a new project. CEOs are often greedy don't get me wrong, but they will take it out on their subordinates long before they take it out of their paycheck. It would be foolish to think that they would give up their share while everyone received their royalties.
Put into that, the guilds who will take their own share of the production costs, not because they offered a service, but simply because they hold the contracts of the actors. I get non union labor means less job security, but there are layers of bureaucracy and regulations that can choke companies and projects. We nearly lost twinkies due to a union strike. These charges can also rack up for smaller and indie dev teams. They would be forced to only use the unions, and have to pay for their dues.They might not even be able to hire devs to double as actors if the guilds decide it to be so.
Here is the bottom line though. Voice actors can be nice, they can spice up a game nicely to make dramatic moments really sink in. But we have been shown as well, time and time again, videogames don't always need actors to be great. Shovel Knight and Undertale are two recent examples, of games that tell a story through good writing, and compelling gameplay. Voice actors, do not make a game great. They add to the experience, and help to make it better. Some games can suffer for bad or even a lack of acting, but can still manage some acclaim if done right.
Thats my rant for today, just now gonna wait and see how this progresses. maybe it will be better for all, or maybe a lot of actors will soon find themselves unemployed, who knows?
