Opposition parties are not there simply to sabotage; they are there to try to get the government to pick what they consider to be the right options, rather than take the opportunity to push their favourite ideology hobby horses on all of us. Naturally, if a party is concerned with their own area rather than the whole of the UK, then they may have a "hidden" agenda to merely spoil things if they don't get their own way. If that scenario is ever possible we will have to see what happens.
The problem with the right wing is that they are prepared to try most anything that that appeals to them in order to give those in business their head; no matter what it inflicts on the majority of decent folk who are, or wish to be, employed. Most do not want hardship today in exchange for the promise of jam tomorrow. If a chancellor is going to take years & years getting things sorted they could at least minimise hardship for the masses.
As for Cameroon being doomed, did he not say he doesn't intend to stand for a third term anyway ? And looking for a third term on the trot win is optimistic anyway. One would need opposition that the public has no faith in, in order to achieve that.