It is nowhere close to meh. A great many people still feel disgusted & ashamed by Blair's Iraq crusade. Millions marched back then, and millions still feel horrified. They can't do too much about it other than not vote in a Blairite party.
Millions did march you are right, but in a country whose population is 66 million it is a drop in the ocean. I'm not saying anyone will say it was great, it is all negative. But I think it was behind a shift in Labour trying to distance itself from it, that they didn't need to do. The anti-war protesters that are mainly left leaning would still vote Labour and even if they didn't they would have still secured the seats in those areas due to the population isn't going to vote Conservative and the Lib dems killed themselves by getting into bed with the Tories.
For most of the country it is not an issue that is going to change their voting preferences.
Why do you think so, mate?
They won 3 elections off the back of it, could have won a fourth had Brown called for an election when he was in the ascendancy. They were not thrashed after 13 years of power unlike what happened to the Tories in 1997. Most of that was down to Brown having the charisma of a boiled egg and the fact that the Conservatives had found a leader who was fresh enough to look like it was a new start.
Speaking of which and the reason why the argument rings true, is that Cameron won two elections using similar Third Way tactics to cover the centre ground and even an appeasement of sorts to the left with his one nation polices. Although his was sprinkled with added austerity on top.
Now the parties are moving ever further in opposite directions the centre is plum for taking if a major party can bridge that divide. As above regarding the Iraq issue, Labour looked to reshape opinions by dismissing and condemning the Blair/Brown governments instead of embracing what they did well and outwardly projecting what they had learnt from any mistakes.