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Well depending on your business plan, its either scoped to support your current and projected usage, so if it is good now, it will be good in 5 years. If your plan is one with increasing users then you;d be moving to multi-homed fail over sites and expanding as you go along in any case. Typically you'd end up with a load balancer, a couple of varnish servers, a nginx, two application servers and a master/slave/slave db setup. So you can migrate the box further down the line to say an admin console or logging server.
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