I own two fancy Southwests that were made during the Franklin era. I wouldn't pay half as much for fancy cues that are made today. There is nothing stopping Southwest from producing a lot of fancy cues if they decide to hire additional people and start adding lots of inlays. One of the reasons that Fancy Franklin Southwests are so valuable is because he didn't make very many. If an when Southwest stops making pool cues and they only make very few fancy ones in the upcomming years then those cues should also go up in value quite nicely.
Barry Szamboti worked for Gus for quite a few years and I am sure had a hand in building quite a few Gus cues. These cues are going to be worth more because Gus was alive when they were built, it doesn't matter who actually handled every aspect of building the cue.
So in my opinion as a collector Franklin era cues are always going to have a premium over cues that were made after his death.