Yes, though the other issues remain and stainless is very different from "ethernal" (much longer lasting, yes, 2000 years I doubt), besides stainless steel (whi

Yes, though the other issues remain and stainless is very different from "ethernal" (much longer lasting, yes, 2000 years I doubt), besides stainless steel (which is very expensive, 4 to 6 times common reinforcing steel as an order of magnitude) also zinc or resin coated steel is used. Concrete is only a good material to resist compression forces - generally speaking - it was used by Romans only in structures that were exclusively (or almost exclusively) subject to compression (arches). The revolution that reinforced concrete made was about combining two materials (steel very apt to resist tensile forces and concrete very apt to resist compression) with very similar other characteristics (thermal expansion) and compatible between them, if you want it is one of the first examples of composite material, to obtain something that could be used in structures subject to tensile and compression (besides shear) forces. Our recently (last 100 years or so) reinforced concrete structures are very lean and elastic, which implies that they move and crack. All the research on new concrete is about making mixtures where cracks are reduced to the minimum, as before or later through these (micro) cracks air and water penetrate, oxidizing (or rusting) the steel. As well in the years the norms about the cover (i.e. the minimal distance from steel to the outside) has been increased (it depends on countries and types of structure but 30 years ago 2 or 2.5 cm were common, nowadays 4 or 5 cm are common).