Fair points on TC's g-force/g-system longevity.
Maybe I'm just frustrated with the overall pace of innovation in the fx computer processing industry (fractal by and large notwithstanding). The radical improvements in consumer electronics over the past 15 (e.g. touch interface, exponential increase in processing power, software and user interface improvements, etc.) years haven't really had a counterpoint in the fx computer hardware space. TC's product line up in my opinion is a glaring example of this gap. Purely a personal frustration here.
Consumer electronics have umm...err....more consumers. So the sheer number of bodies and minds working to improve those things is probably several orders of magnitude higher than those working in musical electronics. And musicians are generally very slow to adopt new things. Why? Because the new stuff is seldom appreciably better than the stuff they've already got.
I also think you're wrong. In the last 15 years we've seen things like:
The Eventide H9 which pretty much sounds as good (or arguably better) than a ton of rack gear costing many thousands of dollars more.
Line 6 went from the POD 2.0 kidney bean to the HD500X which is a radically better user experience plus a foot controller and a ton of I/O options.
Zoom has a Bluetooth pedal the size of a typical stompbox capable of very good amp simulations and multiple other effects for $150 and is updateable from a cell phone.
TC Electronics has gone from building one of the most iconic delay units of all time to several mainstay multi-fx rack processors to the G-System (which is very kickass) to stompboxes that can be updated by pointing your cell phone at your guitar pickups.
Not to mention that music manufacturers are doing all sorts of things to tie into all the other improvements in consumer electronics - phone/tablet integration, touch screen support in DAWs, etc.
To me the most amazing thing in the last 15 years has been with live sound. The latest offering from QSC is incredible. They make a 20-input mixer that has a touch screen UI, multiple effects processors, full outboard type processing on every channel/aux/DCA, wireless networking for remote control, and direct to USB multi-track recording all for $1299. Before stuff like this or the similar products from Presonus and others, to get the same capabilities you'd end up with multiple rack effects, about 19 or 20 compressor/limiters, over a dozen EQs, mic splitters and an I/O to record, plus the mixer, a stack of racks, and a van to haul all that stuff. Oh and you still wouldn't have wireless mixing. All of this fits in a carrying case the size of a large briefcase.
Overall, I'd say the music industry is doing a pretty good job innovating.