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So far i Know there are already plans to bring saveable builds, here some suggestions of me.
5 changeable, saveable builds
I think 5 saveable Builds to switch between are enough, the first build is free (2g for the Training Manual) and each further build does double the price (32g for the fifth). To delete one of the builds increases the costs for each build in the same way (3,5s with your one free build, 56s with 5 builds). 5 Builds is still a limitation, but you can at least create one build around any traitline.
You can switch freely between them once per day (24h CD, otherwise you can pay the switchfee at a trainer). The switch cant be done in combat and will give you only the points in the traitlines. You will have a list for each build to choose from (nameable, includes traits and skills (6-10), similiar to GW1). To load one of this lists has no CD and can be done so often like possible. Changing Traits and skills is may fast, but it still needs some time, especially after not playing this profession for some time.
5 non-changeable, saveable builds
There will be 5 further builds, the first is not for free but costs 2g, the other costs are identical. These 5 Builds will hinder you in switching your traits, thats the only difference. Why these 5 builds? I think 10 changeable builds are to many, there should be a slight limitation (5 builds around each traitline works well for me, i have to think hard about any possible combinition in this build and want at least 30 points in each traitline once.), but there are most likely some (mainstream-)builds with traits not included in this limitatition.
One really great mesmer damage build is 20/20/00/25/05 with Empowered Illusions, Greatsword Training, Phantasmal Fury, Blade Training, Compounding Celerity and Wardens Feedback (Greatsword+Sword/Focus), I actually dont like this build too much, escpecially further combinations, but for pure damage I really want it. Some other examples are skill traits, if there are enough traits around one skilltype you can create a build only around them, which oftens miss good alternate traitcombinitions.
Also there exist really strong combinitions you don’t want to miss, for example Illosionary Persona and Restorative Illusions or Imbued Diversions and Confounding Suggestions. Bozt cases have two Grandmaster-traits, leaving only 10 points left. I actually dont like this traitcombinitions for alternate traits, so i dont play builds with these combinitions makeable. If there are some builds you rather dont like but with one great trait combination, than i only need this build for this combinition. Mainstream is not without reason mainstream.