Will every Muslim end up in Jannah eventually?

So yes, anybody that says 'La ilaha illallah Muhammad Rasulullah' and that is Muslim, will enter Jannah at some point in time. The key issue is that anybody that's Muslim and has sins that are not expiated will also have to have them expiated before they get into Jannah. Because there are no Muslims in Jannah that have sins on them. All the sins have to be either forgiven in this life or expiated in the next. Now sometimes it may be a bit difficult if somebody is a Muslim and they've wronged us in some way, shape or form, to know that at some point in time they will enter Jannah. But we have to also bear in mind that number one, Allah is the most just. Number two, that this expiation for their sins is not something small either. Remember that the lowest punishment in Jahannam are shoes of boiling water that are so hot that they boil one's brain just from the shoes. So it's not something that you have to do. It's not something that we should think is small at all in any way. And we should always trust in Allah's plan and that Allah is the most just.