-- even if the only true positive will be giving people what they said they wanted (no-one can deny this one, can't they?)
They most certainly can and do.
With the petition for a second referendum now standing at well over 4,000,000 signatures, it will need to be debated (just not yet). The likelihood is that the Parliamentary committee will defer it until a later date.
In the meantime all this matters little as the UK heads towards crisis mode, with the country split, the opposition in disarray and negotiations for exit having hit the buffers even before the first exchange. But the bottom line, is that Britain is a
Parliamentary democracy - and in the final analysis Parliament will decide.
Add to this the growing unease being publicly aired by several QC's - Geoffrey Robertson, Charles Flint and Jolyon Maugham (to name but three), and the matter under review by consitutional lawyers, I suspect that it's now only a question of time until a legal challenge is mounted.
For anyone interested in a more detailed analysis of the issues involved, I'd suggest reading this blog post:
https://ukconstitutionallaw.org/2016/06/27/nick-barber-tom-hickman-and-jeff-king-pulling-the-article-50-trigger-parliaments-indispensable-role/What's that expression ... A dog's dinner ?