I agree that consumer boycotts can be useful and is a good start. However boycotts are an individualistic way of struggling, if you do not buy say nike goods, how can you stop others from buying them. also it raises the question of: so you can't buy this good, so what can you buy. Everything produced under capitalism is the result of exploitation. No space is left un-commodiefied. should we choose between good and bad capitalists when they are all parasites. I think collective struggle is better for example during a strike people have to walk past a picket line to scab, this reduces the chances of people doing this. As everyone is collected in a work place it is easier to win over people who might decide to scab.
Whereas someone could easily go and buy nike products and thus the boycott is weakened without anyone knowing. Workers power is greater than consumer power. Workers through interaction with the environment create all wealth under capitalism. Therefore they have the power to stop profits as well.It might be harder to win someone over to a revolutionary position than just not buying goods yourself, but i think it is vital to kill the beast once and for all, through the overthrow of the capitalist system.