Bit harsh on jlp. There are so many places that will not have wifi (and Internet) so Cloud updates cannot be relied on.LOL. You must be young. They said the same thing about: removing floppy drive, removing optical drive, removing magsafe, removing headphone jack etc. etc.
As for how you connect to a mac w/o a cable, you can do that now easily from Xcode. When we write code and want to run it on our devices, it wirelessly transfers and can be controlled from the mac without wires. Just uses bluetooth/wifi. The "slow internet" isn't relevant since the connection is peer-to-peer.
"The sole reason would be greed" is an uninformed statement. There are lots of good reasons to get rid of the port. Lower cost, more room for battery, more resistance to water and dust, remove a point of failure, etc. etc. More proof that it is an uninformed statement is the rest of your sentence "to sell their dongles and cables." This gets RID of dongles and cables. Just sit your iPhone next to your mac, and you're good to go. Heck, you don't even have to be nearby if you are on the same wifi network.
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"right now" is the key (and it's not quite accurate - there are volumetric charging technologies). And if everywhere you go there is a charging pad, you're fine. And there is already a power bank that uses wireless charging, so you aren't out of luck if you are moving around, either.
So every hotel is going to but a charger in every room? Eh, no. And one that works with 98% of phones? No again.
Until then, there is no problem with a cable.