no worry, won't be simless like wimax devices. look at LTE modem/phone/tablet, already know simcard needed.
and would be all in 1 simcard - ie. if LTE network no in coverage, will auto switch to 3G. no need worry about this.
both 3G and LTE will stick together - (see our 3G network case- being running so long, still got ppl saying just getting EDGE signal). other countries also doing this way now.
and this is interesting part:
imagine u r the management of telco responsible of maximising 'value' for shareholders , not to get [replaced] should members not happy at agm, what would u do to maximising profits and keep company growing.. (hehe, then with this idea behind, u would probably know how telco will do)
similarly as streamyx vs unifi, as ppl claiming streamyx quality degrading due to (xxxxx), then ppl lean to sign up unifi fiber (get the idea?)
** btw, hotlink simcard now can use maxis 3g on usb dongle also? then i go get 1 try today - to help congest the network a bit

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Luckily I didn't live at the same location with you or another bandwidth competitor