They could, but the track record of RDG is very poor in this area. Maybe GBR will be created as entirely separate from GBR with no commonality, but I won't believe that until I see it.Why? There is no reason GBR can't design its own system - there might even be ex- Trainline employees looking for jobs.
Why do you think ex-Trainline employees would be looking for jobs? Yes, there will absolutely be a reduction in jobs to maintain the various branded versions of the site, but those people will likely be very different to those behind the core of the journey planner, surely?
Creating an effective journey planner absolutely is complex, and I see no evidence of any complexity going away; the direction of travel from the DfT is actually to add more complexity under the guise of less.The current complexity will no longer be required in a unified railway - that's the whole point!
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Maybe, but I am not sure ther are that many people who think that if you want to travel on (say) LNER & Northern that think you can't just book it on either of those sites, but also think you should use Trainline as a workaround.On this, I think @Bletchleyite is more right than you would like to own. I find it very common for colleagues, friends, and family to believe that (like airlines) operator websites will only sell their own tickets and therefore to think that they need to buy elsewhere for anything else. That then favours Trainline, because it has the brand recognition as an independent retailer.
OK maybe some people do think that way, but hardly enough to start the sentence with "People think...."; if he had said "Some people think..." then I wouldn't necessarily disagree, but it surely isn't going to be vast numbers.
I expect the vast majority of people surely use Trainline because of the brand recognition and/or they like the look/ease of use of the website/app.