Any new design-in should evaluate a current-production Cortex-M4 or M7 part with Ethernet and CAN — the Stellaris family has no direct active replacement.
What the 80 MHz and 256 KB Flash buy you
The 256 KB Flash holds a moderate application — a bootloader plus a full Ethernet+USB+CAN firmware image fits, but a camera or audio pipeline would push into external memory territory. The 64 KB SRAM (organized as 64K x 8) is shared between code data and stack; if you need large frame buffers or multiple protocol buffers, plan for external SRAM or a part with more on-chip RAM.