The objections to or the support of the clock can come from various points of view, and from different people.
Generally there are several distinctive groups of people, that claim different things.
Group 1: the supporters of the shot clock, who think that the shot clock will stop the general time wasting/shorten the matches.
They are also mostly people who think that the time wasting is directly related to need of rest, or that is the main reason why it happens: those people will be disappointed.
Group 2: the supporters of the shot clock who think that the shot clock is a legitimate tool to tackle the problem of stalling on crucial points.
Generally those people think that the time wasting has tactical purpose of ruining the rhythm and focus of the opponents, and think that it is worth a try: those people will not be disappointed.
Group 3: people who don't mind the shot clock, because they think that it will not change anything in regard to what liberties the players will be able to take: those people will be disappointed.
Group 4: against the shot clock, because they think that the shot clock limits in any way the perfect preparation of the players.
Generally those people are extreme fans that don’t want their favourite to be punished for anything he does: those people will be disappointed
Group 5: against shot clock, because they cannot foresee how the new rule will affect their favourites, and don't want to "risk" anything.
Generally those people are the most vocal group, presenting the opinion that the shot clock is useless, because it solves a problem that doesn't exist/nothing will change.
They are also the group that engages in the (faulty) suggestions that all the proponents of the shot clock expect that the rule will shorten the matches.
Those people will be disappointed.