I don't think we can assume the original texture is retained. Meaning once you've terraformed it, that's the way it is, there's no way for the server to erode it back to it's previous orientation; not to mention if you've lowered the land, having it 'erode' upward doesn't make much sense.

Also, for area's that aren't abandoned, if they erode they can't be fixed because you can't terraform around existing structures.

The concept of 'living' islands, subject to the forces of wind and rain, is OK. But for sure there's never been any rain, and I'm not even sure the planet has an atmosphere to generate wind.

Should terraforming decay like walls? No. god no. Yeah, no.

Besides, finding the 'ruins' of some old terminal terraforming would be kind of interesting.

what is this strange feeling coming over me .... im having to agree with syndic... *shoots self in head*

No i agree it would be cool to be able to see the remains of past empires! walk over an island that has been abandoned & see old fortifications

It lets the players feel like they can leave there mark on the game .... literally lol

True Pros make a Podcast to influence the Devs minds, 
The rest of you guys are Hacks

PS. I got my Highways & stopped playing b4 they came in & have never used them! ...... Irony much ?

i didnt write "erode it back to its previous state within 4 weeks".

first, quoting Wikipedia:

Im not talking about  terraforming un-done by the server - only an algorithm randomly smoothing and withering the islands, removing ugly spikes and sharp corners from former player settlements that are not frozen/fixed anymore by buildings and concrete layer

your already stating in your argument that Terraforming doesn't work around buildings - if they are still there, why would the landscape there erode? I have request up on the forums asking for making concrete more then just something to prevent plants from growing.

about the speed things are happening: erosion is usually slow, very slow - except for things that naturally will move TONS of dirt in a matter of hours like: Volcanic erruptions, Eearthquakes, Meteorites... or fusion-bombs.

A fortification would still last several month and if no other player starts to interfere, the rough shapes would still be visible for an (game) eternity... like in RL

If erosion was occuring at any noticable rate, all those other gamma islands could end up being totally flat by the time they were opened - especially those yellow ones

natural erosion made these areas total flat:
Example 1

Example 2

and especially this one!

Nice troll Arga, we'll take gamma when we need to, and if we want to

No one needs gamma and opening a gate isn't taking an Island, but we'll be waiting if you ever do try either.   And you'll be thankful that the island isn't completely flat from erosion!

ZOMG How cool would it be if explosions left craters (size depending on strength). Mech, small dent, main terminal large crater, plasma bomb (artillery someday maybe) small crater.