There's no reason the offloads can't work with QUIC. Linux already has UDP GSO (https://lwn.net/Articles/752184/). There's no technical reason I can think of that kTLS cannot be implemented for UDP on Linux, it's just not there today.
There are also more general efforts underway on Linux to reduce the system call and copying overhead of processing packets in userspace. TPACKET_V3 is an easy way to vastly increase the scalability of UDP recv processing with minimal application changes. AF_XDP is much more extreme, but it is going to be more implementable than the older DPDK-style semantics. It effectively will put packet buffer management into userspace with the transport. But once you're doing that have recaptured much of the advantages that TCP has by running in the kernel.
There are also more general efforts underway on Linux to reduce the system call and copying overhead of processing packets in userspace. TPACKET_V3 is an easy way to vastly increase the scalability of UDP recv processing with minimal application changes. AF_XDP is much more extreme, but it is going to be more implementable than the older DPDK-style semantics. It effectively will put packet buffer management into userspace with the transport. But once you're doing that have recaptured much of the advantages that TCP has by running in the kernel.