Scotland are currently bottom of the table after losing to Ireland and France more heavily than Wales did to Italy and England and, like the Welsh, are desperate for a win.
And Bennett, a member of the great Wales team which won the Triple Crown three years in succession in the 1970s, expects the Scots to come out firing in order to take the heat off coach McGeechan.
"He has taken some stick for the first time in his coaching career and I fear Scotland will come out fired up," he said.
Bennett believes it could all come down to the performance of the Welsh forwards.
They showed plenty of combative spirit against England and would have a good chance were they to repeat that performance but their showing against Italy in Rome was poor.
Bennett said: "We have the backs to win matches but if the forwards play like they did in Italy then we have problems. If they play as well as they did against England then we can win.
"Players like Kevin Morgan and Rhys Williams have pace to burn but I'm sure Gregor Townsend will want to pull the strings for Scotland."
If Wales lose, Bennett fears that Wales will end up finishing bottom of the Six Nations without a victory.
"They have Ireland at home, who are playing out of their skins, and France out there, which speaks for itself. Scotland against Wales definitely looks like the wooden spoon match," he said.