IMHO, Rebel with a kit lens(-es) is a decent grade.
IMHO, putting L lenses on your Rebel is NOT an upgrade. At the short focal range it's an overkill and sometimes awkward to use, while at the long focal range it's a compromise (cheaper).
IMHO, 60D/70D and 7D/7DII are the better implementations of the same grade. They all produce the same APS-C grade images.
IMHO, the "upgrade path" mostly works for those who don't know what they want
and/or can't afford or are not ready to spend $3K+ on camera gear (just yet
and/or don't care about the difference, don't care to learn it
and/or are easily affected by the "Crop is the new FF" propaganda
and/or want the "extra reach" without the extra weight, which is a myth too. Just wait for that 50(or more)mp FF camera, which may be Sony, but still
Upgrading your camera gear may lead to upgrading your computer, your monitor, your HDD storage and your printer, so that you would be able to actually see the results of your upgrade. Getting an L is not it.