EF-S 60mm is unlikely (note I said "unlikely", not "impossible") to be remade any time soon as it's never been a particularly big-seller and they probably wouldn't make their money back on the R&D. The 180mm is in a similar situation. The two 100mm macros dominate in sales as far as Canon macros go, by such a degree it's a wonder that Canon keep making the 60 and 180 at all.
(Inb4 someone with no sense of perspective says "but I use it, so it must be a big deal!")
EF-S as a whole made a lot of sense and did well for Canon previously, but as sales of APS-C SLR drop off, there really is less and less use for it. With older 35mm bodies becoming cheaper and more available to beginners/lower budgets (a used 5D2 is now what, £550 or so? About the same price as a 200D/SL2 and only a little more than a 1300D), and mirrorless eating up pretty much all of the cheaper market anyway (and obviously taking big chunks out of the high-end market, too), making brand new lenses just for APS-C SLR doesn't make much sense. At the pro/semi-pro market, bodies make little profit and it's all about the lens sales; at the cheaper end, lenses barely break even and though bodies still make a profit, it's becoming less and less each year. If there are any new EF-S lenses from here on, you can be sure they'll be simple (more pancake primes and 'kit zooms', for instance) and/or simple relaunching of existing designs. (e.g. if production can be made cheaper by switching a casing material and moving factory, they might do that and relaunch the lens; it won't be a fully new EF-S lens, though.)
Be prepared for EF-M to take up the space EF-S used to, and otherwise doubling down on higher-end EF lenses, which is where the big profits still are. (Though even that may slide as Sigma and Tamron take a bigger and bigger market share and provide significant enough competition to make Canon lower their premiums.)
