How long is foreseeable future? In 10 years I think LLM accelerator (GPU/NPU/etc) with 100 GB VRAM will cost under 2000 USD.
Beyond that, running inference on the equivalent of a 2025 SOTA model with 100GB of VRAM is very unlikely. One consistent quality of transformer models has been the fact that smaller and quantized models are fundamentally unreliable, even though high quality training data and RL can boost the floor of their capabilities.