Digital anything is a bad investment ( well except Bitcoin if you were early to that game ). But in terms of digital hardware, it's a bad investment. No user-serviceable parts in there. If you have an amp you love, it will last your lifetime if you take care of it. It should always be user-serviceable too. Plus it's not a copy of something, it is what was copied.
If you sell the amp to buy the Kemper, you will be making a parallel move. The amp will be gone, can't make a profile of an amp you don't have. You can acquire other people's profiles I suppose, but it won't be yours. And in 5-10 years when the thing is either not supported or broken, you have NOTHING. No hardware fallback device. You actually have E-Waste, it's worth so little they won't even pay you to take the gold off the traces. An amplifier that works will always be worth at least $350.
Digital products are solutions to problems, not the answer to all solutions. They can do some things very well, but not all things really well. When they break, they are done, you don't fix them. As much as I like Fractal Audio, I hate them. Their product is needlessly expensive because they made it do more than any one person needs it to do. They didn't make a simple device for less that just did a few things EXTREMELY well, they made a complicated one that did everything really well. So the end-user ends up paying a lot of money for features they will never fully utilize. And it will still become useless in 5-10 years.
I feel bad for my neighbor. He bought an Axe FXii when it was about the mid-life cycle ( 1.5-2 years after release ). He was happy with it. And he clamored over the one major firmware release it got. He liked it so much he spent another wad on an Atomic CLR monitor. All in, he is easily $3,500 deep. Then they released the AxeFX iii. You can't even buy an AxeFXii anymore. Luckily it will run the latest firmware. But be aware that the AxeFXiii Mark ii is now out. It's only been a couple of years and the AxeFX iii is already starting to phase out for new models. Fractal Audio has become the iPhone of the guitarist world. Always a new model, always top dollar, and always dead before you totally use it up.