Lisa Murkowski, Collins and Romney would not vote to end the filibuster, neither would Graham. Trump and the Republicans had greater control of the senate and the house from 2016 - 18 and they never even proposed reversing the filibuster. Obama had reversed the filibuster for judicial appointments and then Trump did the same, but historically judicial appointments had not been filibustered (Thomas for example got less than 60 votes but was not filibustered)
So essentially what Obama was doing was just holding up filibuster tradition.. The Democrats are are wrong to try to reverse the filibuster. Especially since in all likelihood they will be its biggest supporters in about 3 years...