Of the major distros, Debian and Ubuntu have not been and will not be borged.
With Debian, I wouldn't be so sure. Debian already offers systemd as an alternative to System-V init; the question is really whether systemd will be made the default init system on Debian GNU/Linux installs. The main counterargument is that systemd isn't available on Debian GNU/kFreeBSD, but there are various conceivable approaches the project could take to sort this out. There are many people within Debian who would like Debian GNU/Linux to default to systemd like most other major distributions do now.
As far as Ubuntu is concerned, the issue isn't whether systemd is a good init system or not; it's that they funded the development of Upstart and seem to find it difficult to go over to something else. Thus, arguably Ubuntu isn't as concerned with saving FLOSS by eschewing systemd as they are with rallying behind Upstart (which isn't all that different from systemd as far as being »Unix« is concerned). Again, systemd is, in fact, available for Ubuntu; it is just not something that Canonical is pushing at the moment but that may well change in the future.
I personally would consider neither Gentoo nor Mint »major distributions«. Once more, Gentoo does offer systemd but not as the default (yet). Mint will probably coast along with whatever Debian or Ubuntu will eventually do, so it is not out of the question that Mint will eventually go over to systemd.
In general it's the exciting high-churn buggier distros that switched, not the distros that people use for serious work, although eventually RHEL will probably switch.
I think we can pretty safely assume that RHEL and SLES – the main »serious-work« distributions – will be switching to systemd in the very foreseeable future (with CentOS &c. tagging along). As you note, OpenSUSE is already using systemd and SLES usually follows OpenSUSE.
Again, let's wait a year or five and see where we stand then. My money is on systemd.
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