There were plenty of good reasons to go to multiple working. Even in the later days of loco-hauled sets into the 80s and 90s, it was increasingly fixed formations, for those same reasons. I don't think there has been any appetite to give up track capacity for loco changes, staff station pilots, and shunt carriages during the day.This is the problem with the past few decades nailing the flag to the unit mast. It's not flexible and putting units together wastes space with unnecessary cabs and money with duplication of staff. I doubt 80x units would cost more in fuel, Voyagers must be some of the most inefficient trains going in regards to fuel consumption; I hate to think how much they use. To be honest they're a total relic and need replacing but I appreciate this won't happen. They really should never have been allowed to order diesel only units especially as they replaced electric locos, a ludicrous move.
Potential traffic? They've spent the last 22 years with severe overcrowding and the only solutions being to price people off and steadily retreat into the core network. All of the other InterCity TOCs have received or are about to receive new trains whilst they've had to scrounge for small number of their old trains back plus a long-overdue basic refurbishment. It's not surprising that they're not able to follow the market very well, and that they lack direction as a company. What do you think doesn't make sense about the current services, out of interest?XC doesn't seem to have any market focus. It ignores potential traffic and serves some routes at frequencies that don't make sense.
The only people who have any ability to change the situation are the DfT, and they don't really care. Plenty at XC accept that 4-cars are useless, and that a majority of diagrams need high capacity units of at least 5-cars, doubling up for the core section during the day on most services. In lieu of that, they also accept that it's more realistic that they will instead need to run double Voyagers on the majority of services in the core, and several that extend beyond it.Is that the view of people with the ability to do anything about it, or just one that people have on this forum? Most importantly, is there any evidence in print that Beacon Rail, the DfT or CrossCountry take that view?