Nah, I don't see that happening. Maybe the 11" Apex. Maybe. I agree there is a price gap, but I don't think there is a product gap. Both are similar interfaces and styles. Part of the reason for reorganizing this way was to have a clear difference in the product specs and features. With the Helix, you could go from 5-15". Solix 10-12-15. Apex 13-16-19. So in the 10-15" bracket you had 2 or 3 difference options at different price points. But with what differentiation to get you to pay more? Touchscreen for one. The apex has better processing, but not many really need that. If you're looking at side imaging, you're better off with the bigger screen and not touch screen than the other way around (IMO). So why would someone buy a 16" Apex when a 15" Helix is nearly as good and ~half the price? I'd take a pair of Helix over a single Apex. So the explore is a lineup harmonization/simplification to get some of the features of the solix and some of the helix. Charge a price between the two, and have a clear product differentiation up to the apex (size primarily, some capabilities second). If you bring out a 14" explore, who is going to buy the 13" Apex? Maybe if you bring out an 11" Apex then you could get some to upgrade. Maybe.
All that said, the helix 15 MDI G4N is down to $1700 which is $1k off. That will push the used market down further yet. I think I have a leaning in my quandry above. The 15" helix would be a pretty good dedicated Mega live bow unit with a helix 9 on the console.