Let's look at some data:
In the past 365 days, 15 tags have been created by users with less than 1000 reputation at the time of creation and then used more than once:
Name Used User Link Created RepOnCreation
------------------------- ---- ------------------------------ ---------- -------------
klein-gordon-equation 70 Dimensio1n0 6/26/2013 675
absorption 18 MahderT 10/15/2013 686
optical-materials 15 WetSavannaAnimal aka Rod Vance 7/26/2013 712
coupled-oscillators 11 yankeefan11 11/20/2013 357
scale-invariance 10 user6818 4/24/2013 737
leptons 6 riemannium 9/9/2013 520
soft-matter 6 FraSchelle 6/14/2013 801
ballistics 6 Adnan 9/30/2013 574
humidity 4 Adnan 9/30/2013 574
laser-interaction 4 MahderT 10/15/2013 686
nucleation 4 Nanite 12/11/2013 425
anderson-localization 3 becko 4/18/2013 680
blackbody 2 garyp 3/4/2014 533
5 additional tags created in this period by users with < 1000 reputation currently exist but are only used once on the site.
For contrast, here are the 30 tags created during the same time period and used more than once by users with >= 1000 reputation:
Name Used User Link Created RepOnCreation
------------------------- ---- --------------- ---------- -------------
resource-recommendations 340 Qmechanic 12/10/2013 24196
resistance 143 Qmechanic 8/20/2013 19452
stars 133 Qmechanic 8/1/2013 19212
exoplanets 36 Qmechanic 8/1/2013 19212
pions 20 Ben Crowell 5/4/2013 4632
beyond-the-standard-model 19 Ali 7/23/2013 1028
conductors 16 Emilio Pisanty 10/21/2013 11691
born-rule 15 Dan 8/7/2013 3162
dirac-matrices 15 Emilio Pisanty 12/3/2013 13517
thought-experiment 14 udiboy 10/24/2013 2088
black-hole-firewall 13 Brandon Enright 5/3/2013 1340
time-dilation 12 Emilio Pisanty 2/6/2014 15455
identical-particles 8 Qmechanic 11/1/2013 22626
short-circuits 6 Emilio Pisanty 9/4/2013 9667
charge-conjugation 6 Emilio Pisanty 10/3/2013 11272
plasmon 5 JoeHobbit 3/31/2013 1198
image-processing 4 Dan 7/3/2013 2913
type-i-string 4 Dimensio1n0 9/18/2013 2711
zener-diodes 4 Emilio Pisanty 10/13/2013 11489
ionization-energy 4 Anthony 10/17/2013 1102
canonical-conjugation 3 Emilio Pisanty 10/29/2013 11828
deformation-quantization 3 Qmechanic 9/7/2013 20027
dimensional-reg 3 Hunter 3/1/2014 1368
ground-state 2 Idear 1/8/2014 1132
heterotic-string 2 Dimensio1n0 9/18/2013 2711
nebulae 2 Qmechanic 8/1/2013 19212
affine-lie-algebra 2 user6818 3/25/2013 1166
non-linear-schroedinger 2 Dan 3/28/2013 1839
enthalpy 2 Mostafa 10/21/2013 2051
large-n 2 user6818 2/9/2014 1208
13 additional tags created in this period by users with >= 1000 reputation currently exist but are only used once on the site.
A total of 316 tags were destroyed during the same time period. I've no good way of determining when they were created or who created them, however it is reasonable to assume that most were created during the same time period.
My thoughts:
High-rep users are already handling the bulk of the tag creation. We could raise this limit with only a minor negative impact, provided users with the privilege are able to step up and handle cases where a question is posted without an appropriately-specific tag.
So I've raised it. Step up!