According to the Sunday Times:

A vicious cabinet war erupted last night over a plot by senior ministers to delay Brexit, as Theresa May looked certain to shelve plans for a Commons vote on her deal this week.

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This ability of one person to manipulate Parliament by making promises to assuage rebellions at that time, only to renage on them.later is proving to be a major flaw in our system. Whether or not May does so this time, she has done it in the past. One the Brexiteers will agree with: since the Speaker selects which amendments are called and which are not, that role has a tremendous power vested in one individual.

I suspect whatever happens we might see motions over the next few months trying to give Parliament more powers rather than individuals.