Many companies are doing this already.
They have a very pleasing website or GUI running on a PC and then that makes calls to a mainframe to transfer data between the 2 platforms.
Though Cobol is not a flashy or pretty language, it does what it was designed to do very well – process large files and produce reports.
Cobol needs to be taught in our colleges, at least a semester so that programmers know about it.
Cobol continues to be updated and brought to the PC and even the web.