From across the pond more than one source is suggesting that Doctor Who is approaching the abyss, not to be confused with the Time Vortex. That sort of squares with the impressions I've been getting, and it's also to be expected.
In its original incarnation Doctor Who started in 1963 and was a hit in Britain almost immediately. In terms of international audience―which hinges on America, for better or worse―it really took off in its second decade. That had to do with both Tom Baker's charisma and its discovery by public TV viewers. It's quite plausible that 1980s budget cuts at PBS were a factor in its demise in 1989. But there's also just the fact that what goes up must come down.
NuWho, as its generally called, started in 2005. That's also the year that David Tennant took over the lead role, and when it started peaking in popularity. So compared to its predecessor it appears to have been living an accelerated lifespan. It's not really a surprise that gravity is having its effect sooner this time around.
The question is whether Russell T. Davies, who was the prime mover in bringing DW back in 2005, was the right choice for showrunner again, whether his way is the most interesting way for the show to spend what may be its final years for a while. But from what I understand he was the only candidate considered once Disney got involved with the show's distribution and financing. Disney, yet again.
I tend to think that the Critic's Myke Bartlett is right to suggest that it would be good if they "Trade expensive faux cinematic scale for thrifty domestic folk horror." i.e., go simpler. It would leave them less reliant on MouseBucks, for one thing.